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R. B. TROUSDALE ET AL ELECTRONIC TELEPHONE SYSTEM Aug. 19, 1958 I Filed May 16, 1956 48 Sheets-Sheet 1 II LS-II LINE SWITCH CIRCUIT FIGS. I78: I8

LINE SWITCH CIRCUIT INVENTORS.

ROBERT B.TROUSDALE BY GEORGE ELLIOTT AGENT Aug. 19, 1958 R. B. TROUSDALE ET AL 2,848,549

ELECTRONIC TELEPHONE SYSTEM Filed May 16, 1956 48 Sheets-Sheet 2 LINK Ll MULTIPLE TONESI POINT FIG.|9

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B TRANSLATOR seen so sc4' J SBT so FROM 85 sls' LINKS 4-l5 INCL. SF

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LINK 2 L2 MULTIPLE TONESZ POINT AL- AL-2 LINK Aka ALLOTTER '1' T0 AL-l5 LINKS 4-15 INCL.

. FIGS. 9a IO G o I 0: -J 7- l I BP Aug. 19, 1958 R. B. TROUSDALE ETAL 2,848, ELEc'moNIc TELEPHONE SYSTEM Filed May 16, 1956 48 Sheets-Sheet 5 LINK-l x l5-l j TONES I FINDER CONNECTOR a SCI 29 DIAL TONE TONE PULSE GENERATOR AL-l FIGS. 2|-2a INCL.

FIGS. l5 azo DIAL TONE F TONES 2 FINDER CONNECTOR sca' g- 1958 R. B. TROUSDALE ET AL 2,848,549

ELECTRONIC TELEPHONE SYSTEM Filed May 16, 1956 v 48 Sheets-Sheet 5 LINK 3 MULTIPLE POINT RINGING CONTROL AMPLIFIER p FIG. 34

REGISTER DRIVE PULSE GENERATOR FIG. 34

RDPD.

GENERATOR PULSE GENERATOR FIG.29

MASTER FIGS. 29 $30 OSCILLATOR FIG.29

Aug. 1958 Filed May 16, 1956 LINK 3 TONES3 F'NDER FIGS.

CONNECTOR BUSY LEAD CONVERTER 8 EMERGENCY SERVICE CIRCUIT R. B. TROUSDALE ET AL ELECTRONIC TELEPHONE SYSTEM EXECUTIVE cur-m MARKER 48 Sheets-Sheet 6 TRUNK HUNTING MARKER FIG.4I

Aug. 19, 1958 Filed May 16, 1956 ELECTRONIC TELEPHONE SYSTEM R. B. TROUSDALE ET AL FIG.

FIG.

FIG.

FIG.

FIG.

FIG.

48 Sheets-Sheet 7 Aug. 19, 1958 R. B. TROUSDALE ET AL 2,843,549

ELECTRONIC TELEPHONE SYSTEM Filed May 16, 1956 48 Sheets-Sheet 8 LINK ALLOTTER I6 AL-5 AL-G TO FINDER CONNECTOR LINKS 2-]5 Aug. 19, 1958 R. B. TROUSDALE ETAL ELECTRONIC TELEPHONE SYSTEM Filed May 16, 1956 LINK ALLOTTER I6 AL-S AL-IO J AL-u IOII - AL-l2 AL- la AL-I4 48 Sheets-Sheet 9 AL-l5.

Aug. 19, 1958 R. B. TROUSDALE ETAL 2,84

ELECTRONIC TELEPHONE SYSTEM Filed May 16, 1956 48 Sheets-Sheet 1O LINE SWITCH CIRCUIT FOR EMERGENCY SERVICE LINE 4 LS-22 T0 1'22 EMERGENCY SERVICE CL LINE j 22 cIRcuIT 22 scz FROM FINDER CONNECTOR LINK 2 34 -4a :ESRZ

I l I BILATERAL TRANSISTOR CONTROL STAGES 3-I4 NOT SHOWN l I N.

SCI5 o FROM FINDER CONNECTOR LINK I5 Esms scI' ESR

Aug. 19, 1958 R. B. TROUSDALE ETAL 2,848,549- ELECTRONIC TELEPHONE SYSTEM Filed May 16, 1956 48 Sheets-Sheet 11 CHZZ a H C C R J S R 4 N w LOI L M M m 0 I..H 538 5 M N O 2 A2 H L R l 0 v 8 T .m N 4 III llllll II a 2 ESR Aug. 19, 1958 RIB. TROUSDALE ETAL ELECTRONIC TELEPHONE SYSTEM Filed May 16, 1956 SWITCH BANK TRANSLATOR l3 SBT 48 Sheets-Sheet 12 SCI' ESR

Aug. 19, 1958 R. B. TROUSDALE ETAL ELECTRONIC TELEPHONE SYSTEM Filed May 16, 1956 48 Sheets-Sheet 14 i TONE 8 PULSE GENERATOR 29 BUSY TONE SCI ESR I Aug. 19, 1958 Filed May 16, 1956 R. B. TROUSDALE ET AL ELECTRONIC TELEPHONE SYSTEM 48 Sheets-Sheet 15 LINE CIRCUIT H c T TH 3 I604 IA" WIRING T WIRING.

c R a R2 -43 RYII I I6I6 l I TO ALL LINE |62| R6 0 CIRCUITS |6l7 GEN. I622 h I6II Aug. 19, 1958 R. B. 'II'ROUSDALE ETAL 2,848,549

' ELECTRONIC TELEPHONE SYSTEM Filed May 16, 1956 48 Sheets-Sheet 16 7' TH LINE SWITCH ClRCUlTLS-H I RYII SBT Aug. 19, 1958 Filed May 16, 1956 48 Sheets-Sheet 1'7 LINE SWITCH CIRCUITLS-Il Aug. 19, 1958 R. B. TROUSDALE ETAL 2,848,549

ELECTRONIC TELEPHONE SYSTEM I Filed May 16, 1956 I 48 Sheets-Sheet 18 LINK I MULTIPLE POINT I4-l K I908 I906 Rll A, TONES Y 1 *V I904 l E I907 I I fil LINK2 MULTIPLE POINT I4-2 I TONESZ FROM FINDER I902 WY I 4 CONNECTOR LINK I l I I MULTIPLE POINTS I FOR LINKS 3-I4 NOT SHOWN l l I I LINK I5 MULTIPLE POINT I4-l5 mom FINDER I903 TONES 0 CONNECTOR LINK I5-I5 us LRC Aug; 19, 1958 R. B. TROUSDALE ET AL 2,848,549

ELECTRQNIC TELEPHONE SYSTEM Filed May 16, 1956 48 Sheets-Sheet l9 SCI' LRC

ESR

TONE 8| PULSE GENERATOR 29 

